import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.io.IOException;

public class SessionDemo1 extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        req.setCharacterEncoding("utf-8");
        resp.setCharacterEncoding("utf-8");
        resp.setContentType("text/html; charset=UTF-8");

        HttpSession session = req.getSession();
        // session.setAttribute("username","哈哈");
        Person person = new Person();
        person.setName("刘旭");
        person.setId(1);
        session.setAttribute("username",person);
        String id = session.getId();
        if(session.isNew()){
            //如果新建的session则提示
            resp.getWriter().print("session是新创建的");
        }else {
            resp.getWriter().print("session已经存在，sessionId为：" + id);
        }
    }

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        doGet(req, resp);
    }
}
